Heat exchanger for water heater



FIG. 1 is a front view of a heat exchanger for water heater showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 1; and,

FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 3. 

CLAIM The ornamental design for a heat exchanger for water heater, as shown and described. 